Fix Gemini Code's (GC) smarts.

- The tl;dr; is that GC couldn't see what the user was saying when tool call events happened in response. The rason why this was happening was because we were instantly invoking tools that the model told us to invoke and then instantly re-requesting. This resulted in the bug because the genai APIs can't update the chat history before a full response has been completed (doesn't know how to update if it's incomplete).
- To address the above issue I had to do quite the large refactor. The gist is that now turns truly drive everything on the server (vs. a server client split). This ensured that when we got tool invocations we could control when/how re-requesting would happen and then also ensure that history was updated. This change also meant that the server would act as an event publisher to enable the client to react to events rather than try and weave in complex logic between the events.
- A BIG change that this changeset incudes is the removal of all of the CLI tools in favor of the server tools.
- Removed some dead code as part of this
- **NOTE: Confirmations are still broken (they were broken prior to this); however, I've set them up to be able to work in the future, I'll dot hat in a follow up to be less breaking to others.**

Fixes https://b.corp.google.com/issues/412320087

1 files changed, 89 insertions, 6 deletions

diff --git a/packages/server/src/tools/edit.ts b/packages/server/src/tools/edit.ts
index 67c5a37b..5dbeaf41 100644
--- a/packages/server/src/tools/edit.ts
+++ b/packages/server/src/tools/edit.ts
@@ -7,7 +7,14 @@
 import fs from 'fs';
 import path from 'path';
 import * as Diff from 'diff';
-import { BaseTool, ToolResult, ToolResultDisplay } from './tools.js';
+import {
+  BaseTool,
+  ToolCallConfirmationDetails,
+  ToolConfirmationOutcome,
+  ToolEditConfirmationDetails,
+  ToolResult,
+  ToolResultDisplay,
+} from './tools.js';
 import { SchemaValidator } from '../utils/schemaValidator.js';
 import { makeRelative, shortenPath } from '../utils/paths.js';
 import { isNodeError } from '../utils/errors.js';
@@ -48,8 +55,9 @@ interface CalculatedEdit {
 /**
  * Implementation of the Edit tool logic (moved from CLI)
  */
-export class EditLogic extends BaseTool<EditToolParams, ToolResult> {
+export class EditTool extends BaseTool<EditToolParams, ToolResult> {
   static readonly Name = 'replace'; // Keep static name
+  private shouldAlwaysEdit = false;
 
   private readonly rootDirectory: string;
 
@@ -61,9 +69,9 @@ export class EditLogic extends BaseTool<EditToolParams, ToolResult> {
     // Note: The description here mentions other tools like ReadFileTool/WriteFileTool
     // by name. This might need updating if those tool names change.
     super(
-      EditLogic.Name,
-      '', // Display name handled by CLI wrapper
-      '', // Description handled by CLI wrapper
+      EditTool.Name,
+      'Edit',
+      'Replaces a SINGLE, UNIQUE occurrence of text within a file. Requires providing significant context around the change to ensure uniqueness. For moving/renaming files, use the Bash tool with `mv`. For replacing entire file contents or creating new files use the WriteFile tool. Always use the ReadFile tool to examine the file before using this tool.',
       {
         properties: {
           file_path: {
@@ -225,7 +233,82 @@ export class EditLogic extends BaseTool<EditToolParams, ToolResult> {
     };
   }
 
-  // Removed shouldConfirmExecute - Confirmation is handled by the CLI wrapper
+  /**
+   * Handles the confirmation prompt for the Edit tool in the CLI.
+   * It needs to calculate the diff to show the user.
+   */
+  async shouldConfirmExecute(
+    params: EditToolParams,
+  ): Promise<ToolCallConfirmationDetails | false> {
+    if (this.shouldAlwaysEdit) {
+      return false;
+    }
+    const validationError = this.validateToolParams(params);
+    if (validationError) {
+      console.error(
+        `[EditTool Wrapper] Attempted confirmation with invalid parameters: ${validationError}`,
+      );
+      return false;
+    }
+    let currentContent: string | null = null;
+    let fileExists = false;
+    let newContent = '';
+    try {
+      currentContent = fs.readFileSync(params.file_path, 'utf8');
+      fileExists = true;
+    } catch (err: unknown) {
+      if (isNodeError(err) && err.code === 'ENOENT') {
+        fileExists = false;
+      } else {
+        console.error(`Error reading file for confirmation diff: ${err}`);
+        return false;
+      }
+    }
+    if (params.old_string === '' && !fileExists) {
+      newContent = params.new_string;
+    } else if (!fileExists) {
+      return false;
+    } else if (currentContent !== null) {
+      const occurrences = this.countOccurrences(
+        currentContent,
+        params.old_string,
+      );
+      const expectedReplacements =
+        params.expected_replacements === undefined
+          ? 1
+          : params.expected_replacements;
+      if (occurrences === 0 || occurrences !== expectedReplacements) {
+        return false;
+      }
+      newContent = this.replaceAll(
+        currentContent,
+        params.old_string,
+        params.new_string,
+      );
+    } else {
+      return false;
+    }
+    const fileName = path.basename(params.file_path);
+    const fileDiff = Diff.createPatch(
+      fileName,
+      currentContent ?? '',
+      newContent,
+      'Current',
+      'Proposed',
+      { context: 3 },
+    );
+    const confirmationDetails: ToolEditConfirmationDetails = {
+      title: `Confirm Edit: ${shortenPath(makeRelative(params.file_path, this.rootDirectory))}`,
+      fileName,
+      fileDiff,
+      onConfirm: async (outcome: ToolConfirmationOutcome) => {
+        if (outcome === ToolConfirmationOutcome.ProceedAlways) {
+          this.shouldAlwaysEdit = true;
+        }
+      },
+    };
+    return confirmationDetails;
+  }
 
   getDescription(params: EditToolParams): string {
     const relativePath = makeRelative(params.file_path, this.rootDirectory);